Edgars airtime **** and *****

Good day. I have received messages to pay my Edgars account which was paid up years ago, when I went in to find out whats going on, I was told I am being charged for airtime, which I never subscribed to or received. I was told that this will be cancelled and reversed but again I get messages for payment. I call again and I am told that its in progress, someone will call me. To this date, no calls. I always pay my debts and am in fear of being blacklisted because of this *****. There is nobody that could give me a direct answer.